<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
        <span
          v-if="item.redirect === 'noRedirect' || index == levelList.length - 1"
          class="no-redirect"
          >{{ item.meta.title }}</span
        >
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup>
import { compile } from "path-to-regexp";
import { ref, watch } from "vue";
import { useRoute, useRouter } from "vue-router";

const levelList = ref(null);
const router = useRouter();
// 当前路由
const route = useRoute();

// 解析路由匹配数组
function getBreadcrumb() {
  // only show routes with meta.title
  let matched = route.matched.filter((item) => item.meta && item.meta.title);
  

  // 判断是否为修改和添加页面（根据路由中是否有id参数）
  // console.log(route.query.hasOwnProperty("id"), "route.query.keys('id').length");
  if(route.query.hasOwnProperty("id")){
    // 将当前页的matched中的添加改为修改
    matched = matched.map((item) => {
      if(item.meta && item.meta.title){
        // 如果有添加文字，改为修改
        console.log(item.meta.title.includes("添加"), "item.meta.title.includes");
        if(item.meta.title.includes("添加")){
          // console.log(item.meta.title, "item.meta.title");
          item.meta.title = item.meta.title.replace("添加", "修改");
        }else {
          item.meta.title = item.meta.title.replace("修改", "添加");
        }
        return item
      }
    })
  }
  // console.log(matched, "match111");
  const first = matched[0];

  if (!isHome(first)) {
    matched = [{ path: "/home", meta: { title: "首页" } }].concat(matched);
  }

  levelList.value = matched.filter(
    (item) => item.meta && item.meta.title && item.meta.breadcrumb !== false
  );
}

// 是否是首页
function isHome(route) {
  const name = route && route.name;
  if (!name) {
    return false;
  }
  return name.trim().toLocaleLowerCase() === "home".toLocaleLowerCase();
}

// 手动解析path中存在的参数
function pathCompile(path) {
  const { params } = route;
  var toPath = compile(path);
  return toPath(params);
}

function handleLink(item) {
  const { redirect, path } = item;
  if (redirect) {
    router.push(redirect);
    return;
  }
  router.push(pathCompile(path));
}

// 首次调用
getBreadcrumb();
// 监控route的变化
watch(route, getBreadcrumb);
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
